gcc: remove extra MUSL_DYNAMIC_LINKER

See #5400

srcpkgs/gcc/files/gcc-6.3.0-musl.diff

@@ -137,18 +137,6 @@ diff -r 971d41041173 gcc/config.gcc
  	if test x${enable_secureplt} = xyes; then
  		tm_file="rs6000/secureplt.h ${tm_file}"
  	fi
-diff -r 9555ffb5873b gcc/config/aarch64/aarch64-linux.h
---- a/gcc/config/aarch64/aarch64-linux.h	Thu Dec 24 11:25:06 2015 -0500
-+++ b/gcc/config/aarch64/aarch64-linux.h	Thu Dec 24 11:25:09 2015 -0500
-@@ -32,6 +32,8 @@
- #undef  CC1_SPEC
- #define CC1_SPEC GNU_USER_TARGET_CC1_SPEC ASAN_CC1_SPEC
- 
-+#define MUSL_DYNAMIC_LINKER "/lib/ld-musl-aarch64.so.1"
-+
- #define CPP_SPEC "%{pthread:-D_REENTRANT}"
- 
- #define LINUX_TARGET_LINK_SPEC  "%{h*}		\
 diff -r a522e4b04c77 gcc/config/microblaze/microblaze.h
 --- a/gcc/config/microblaze/microblaze.h	Thu Dec 24 11:25:11 2015 -0500
 +++ b/gcc/config/microblaze/microblaze.h	Thu Dec 24 11:25:13 2015 -0500

srcpkgs/gcc/template

@@ -4,7 +4,7 @@ _gcjrel=17
 
 pkgname=gcc
 version=${_majorver}.0
-revision=1
+revision=2
 short_desc="The GNU C Compiler"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
 homepage="http://gcc.gnu.org"